let's get to the news here at 30 rock in new york city. >>> we begin with general david petraeus and his sudden and unexpected resignation as director of the central intelligence agency on friday, citing an extramarital affair. kristen welker reports. >> reporter: according to a senior federal official and close friend of david petraeus, 37-year-old jill kelly complained to fbi agents about being harassed by ball la broadwell, david petraeus' biographer. a senior official says jill kelly is involved in wounded warrior fund raising in tampa. she is married. petraeus' downfall started when kelly complained to the fbi that she was receiving intimidating e-mails from broadwell. law enforcement and multiple u.s. officials tell nbc news those e-mails led to the discovery between others between general petraeus and broadwell and were indicative of an extramarital affair. >> my first reaction was disbelief. >> reporter: steven boylen is petraeus' former spokesperson. he has spoken to him twice this weekend and says his former boss is remorseful. >> he said he had an excellent job. and in his